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{
    "pk": 41711,
    "title": "A new drepanosauromorph, \nAncistronychus paradoxus\n n. gen. et sp., from the Chinle Formation of Petrified Forest National Park, Arizona, USA",
    "subtitle": null,
    "abstract": "Drepanosauromorpha is an extinct group of reptiles known from the Middle Triassic to Late Triassic (237–212 Ma). The clade currently includes seven genera (\nAvicranium, Dolabrosaurus, Drepanosaurus, Hypuronector, Kyrgzsaurus, Megalancosaurus, and Vallesaurus\n) that are known from fossils collected in Europe, North America, and Asia. These discoveries have helped shape our understanding of the biology and diversity of drepanosauromorphs. Here we describe \nAncistronychus paradoxus\n n. gen. et sp. from the Chinle Formation in Petrified Forest National Park, Arizona based on the ungual phalanx of the second digit of the manus. A characteristic that this taxon shares with \nDrepanosaurus unguicaudatus\n is the pronounced size of the ungual relative to the penultimate element. It differs significantly from \nD. unguicaudatus\n and the Hayden Quarry \nDrepanosaurus\n in the shortened proximal dorsoventral height of the claw, its great transverse breath, the presence of both a furrow on the midline of the extensor surface and a cleft on the apex, and a broad and flattened terminus. We suggest that\n A. paradoxus\n is likely closely related to \nD. unguicaudatus\n and the Hayden Quarry \nDrepanosaurus\n, but missing phylogenetic data precludes a more definitive assessment at this point. \nAncistronychus paradoxus\n highlights unsuspected morphological variation within Drepanosauromorpha and suggests that different drepanosauromorphs used their enlarged second manual unguals for distinct functions enabling them to fill different ecological niches.",
    "language": "en",
    "license": {
        "name": "Creative Commons Attribution-NonCommercial-ShareAlike 4.0",
        "short_name": "CC BY-NC-SA 4.0",
        "text": "<p><!-- x-tinymce/html --></p>\n<p>Readers are free to:</p>\n<ul>\n<li><strong>Share</strong> — copy and redistribute the material in any medium or format</li>\n<li><strong>Adapt</strong> — remix, transform, and build upon the material<br><br>The licensor cannot revoke these freedoms as long as you follow the license terms.</li>\n</ul>\n<p>Under the following terms:</p>\n<ul>\n<li><strong>Attribution</strong> — You must give appropriate credit , provide a link to the license, and indicate if changes were made . You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.</li>\n<li><strong>NonCommercial</strong> — You may not use the material for commercial purposes .</li>\n<li><strong>ShareAlike</strong> — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.<br><br>No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.</li>\n</ul>\n<p>Notices:</p>\n<p>You do not have to comply with the license for elements of the material in the public domain or where your use is permitted by an applicable exception or limitation.</p>\n<p>No warranties are given. The license may not give you all of the permissions necessary for your intended use. For example, other rights such as publicity, privacy, or moral rights may limit how you use the material.</p>",
        "url": "https://creativecommons.org/licenses/by-nc-sa/4.0"
    },
    "keywords": [
        {
            "word": "Drepanosauromorpha, Ancistronychus, Triassic, Norian, ungual"
        }
    ],
    "section": "Article",
    "is_remote": true,
    "remote_url": "https://escholarship.org/uc/item/8x7767f8",
    "frozenauthors": [
        {
            "first_name": "Gabriel",
            "middle_name": "S.",
            "last_name": "Gonçalves",
            "name_suffix": "",
            "institution": "Department of Biology, University of Washington, Box 351800 Seattle, WA 98195-1800",
            "department": "None"
        },
        {
            "first_name": "Christian",
            "middle_name": "A.",
            "last_name": "Sidor",
            "name_suffix": "",
            "institution": "Department of Biology, University of Washington, Box 351800 Seattle, WA 98195-1800; Burke Museum, University of Washington, Box 353010 Seattle, WA 98195-3010",
            "department": "None"
        }
    ],
    "date_submitted": "2019-12-16T02:31:06Z",
    "date_accepted": "2019-12-16T02:31:06Z",
    "date_published": "2019-12-15T08:00:00Z",
    "render_galley": null,
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            "type": "pdf",
            "path": "https://journalpub.escholarship.org/ucmp_paleobios/article/41711/galley/31202/download/"
        }
    ]
}